With these considerations, the equation of motion (REF ) can be further simplified into the standard parametrized form [1]}
\(h_A^{\prime \prime } + (2 + \bar{\nu }+\nu _A) {\cal H} h_A^{\prime } + (1+\bar{\mu }+ \mu _A) k^2 h_A=0,\nonumber \\\) 
